ISSN: 0149-6115
Page Count: 12

A Laboratory Study of the Hysteresis of a Thermal Conductivity Soil Suction Sensor

Feng, M
Golder Associates Ltd.,Saskatchewan,

Fredlund, DG
Professor and Research Associate,University of Saskatchewan,Saskatchewan,

Shuai, F
Professor and Research Associate,University of Saskatchewan,Saskatchewan,

(Received 6 July 2000; accepted 2 October 2001)

Abstract

An experimental program was set up to study the capillary hysteresis of the ceramic block for a newly developed thermal conductivity soil suction sensor. The testing program included two series of tests: one series of tests measured the capillary hysteresis of the ceramic blocks and the other measured the hysteresis of the relationships between the suction sensor output and the applied suctions. Test results show that there can be approximately 40% error from the correct suction value if the conventional calibration curve is used without considering the effects of capillary hysteresis. Based on the experimental testing program, a mathematical approach, which is able to take into account the effects of capillary hysteresis, was proposed when interpreting the measured soil suction data.

Keywords:
matric suction, soil suction sensor, capillary hysteresis

Paper ID: GTJ11095J
DOI: 10.1520/GTJ11095J
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